56 results about "Underwater network" patented technology

The invention relates to underwater acoustic sensor networks and a node deployment and networking method thereof. A target water area is covered in a hierarchical clustering manner, the networks are divided into three hierarchies, and each hierarchy is divided into multiple continuous 3D spaces; common underwater sensor nodes are uniformly distributed in different depths of the different hierarchies of the target area, sense and collect physical environment data of the surrounding, and form self-organizing clustering networks via the sound wave links; movable underwater nodes can move in the target water area, assess the water quality change of routes, and directly transmit an assessment result to water surface buoy nodes; and the water surface buoy nodes is mixed with communication modules, receive, process, gather and integrate underwater network data via the sound wave communication module, and transmit the network data to a land base station in the multi-hop manner via the radio electromagnetic wave communication module. The underwater acoustic sensor networks and the node deployment and networking method thereof can realize remote monitoring, is wide in monitoring range, high in expansibility and reliability, suitable for underwater applications, and has a good application prospect.

The invention provides an underwater acoustic network reservation multi-access method based on active time reversal, and relates to the technical field of underwater acoustic communication and underwater networks. Multiple access in the data transmission process among nodes, which is applicable to a distributed acoustic network MAC layer, is adopted, so that the transmission conflicts are avoided, the success probability and channel utilization rate of once transmission are substantially improved, and the networking energy consumption is lowered; by means of active TR space-time focusing and the space change characteristic of an underwater acoustic channel, the disadvantages are converted into advantages, the broadcasting characteristics of the underwater acoustic channel is weakened, the signal interference among adjacent links under a distributed multi-hop environment is effectively isolated, and the good transmission concealment and security of the multi-access method are realized by channel broadcasting weakening, so that the space multiplexing is improved, the network throughput is increased, the time delay of the system is shortened, and energy is saved.

The invention discloses a UWSNs node positioning method based on node movement prediction. Aiming at the mobility problem of underwater sensor nodes, the movement model of underwater nodes is studied, and a node movement prediction algorithm is adopted to solve the problem of node mobility while saving energy. Reduce network energy consumption and prolong the life cycle of the network. The accuracy of the node movement model depends on the accuracy of the node position, so in the positioning algorithm, the ranging strategy is firstly proposed, that is, to improve the positioning accuracy and further reduce the energy consumption of the node, and then estimate the position of the sensor node, aiming at accurate The gray wolf algorithm is used for optimal calculation of secondary nodes with low degrees, which reduces the positioning error of nodes. Compared with traditional mobile prediction algorithms, this algorithm has improved network energy consumption and sensor node positioning accuracy, and effectively solves the problem of short underwater network life cycle.

The invention discloses a large-scale DVPN networking method. The method includes: Spoke establishes a DVPN tunnel with Hub, sends its own downlink subnet information to Hub, and obtains downlink subnet information sent by Hub to itself and other Spokes and the corresponding next-hop private network address. Based on the same inventive idea, the present invention also proposes a Spoke, which improves the flexibility of DVPN networking and reduces the system overhead and routing configuration of Hub in large-scale networking.